MAXTECH, Inc. Technology for Communications BRC-1000 Series C-Band Redundant LNB Systems Introduction Redundant LNB systems minimize system downtime due to LNB failure by providing a spare LNB and an automatic means of switching to the spare upon failure of a primary LNB. A 1:1 system provides one spare LNB for one primary LNB. A 1:2 system provides one spare LNB for either of two primary LNBs. A Dual 1:1 system provides full 1:1 redundancy on each of two polarizations. The systems consist of an outdoor plate assembly which mounts at the antenna hub and an indoor control panel. System Block Diagrams Plate Assembly Features Low Noise Block Converters High quality waveguide/coaxial dual switches Manual override Waveguide input flanges Tx reject filter, coupler, offline I/O, and input isolator options available Control Panel Features Standard 19" rack panel, 3½" high Dual, redundant power supplies Worldwide AC input capability Manual or automatic operation Monitors LNB bias currents to detect faults Automatically switches to standby LNB when fault occurs Optional RS232/422/485 interface 7239A 1
MAXTECH, Inc. Technology for Communications System Specifications * BRC-1000 Systems Parameter Notes Min Nom/Typ Max Units Input Frequency Range Band A 3.7 4.2 GHz Band B 3.625 4.2 GHz Output Frequency Range Band A 950 1450 MHz Band B 950 1525 MHz Noise Temperature, System At +23 C See Table 1 Versus temperature See Table 2 Gain Standard LNB 60 63 db Gain Flatness Per 27 MHz ±0.5 db Gain Stability Per day, constant temp ±0.2 db Versus temperature -0.05 db/ C VSWR Input, no isolator(s) 2.00 :1 Input, with isolator(s) 1.25 1.30 :1 Input with isolator(s) and Tx reject filter(s) 1.30 1.35 :1 Output (75 ohm) 1.50 2.00 :1 Power Output At 1 db compression +2 +5 dbm Third Order Intercept Output (OIP 3 ) +12 +15 dbm Local Oscillator Frequency 5.15 GHz Frequency Stability -40 to +60 C ±10 khz Phase Noise 100 Hz Offset -55 dbc/hz 1 khz Offset -75 dbc/hz 10 khz Offset -80 dbc/hz 100 khz Offset -90 dbc/hz Maximum Input Power Without damage 0 dbm Desensitization Threshold No Tx filter(s) -10 dbm for 5.825 6.425 GHz in With Tx filter(s) +45 dbm Connectors RF Input CPR229G Waveguide Flange RF Output Type F Female Offline In, Coupler In Type N Female Offline Out Type F Female Temperature Range Switch Plate Assy -40 +60 C When there is only one value on a line, this column is a nominal value. Otherwise it is a typical value. Typical values are intended to illustrate typical performance, but are not guaranteed. * System specifications depend on choice of LNB and various options. Specifications shown are for a typical system using commercially available LNBs. 2 7239A
Part Number/Ordering Information BRC- Table 1 System Noise Temperature with Various Options (Add to T LNB ) 1:1 1:2 Dual 1:1 System Configuration Pol. 1 Pol. 2 Standby Pol. 1 Pol. 2 Standard Configuration (Add to T LNB ) 7 K 7 K 8.5 K 10 K 7 K 7 K With 40 db Crossguide Coupler(s) Add 1 K to Standard Configuration With Transmit Reject Filter(s) Add 3 K to Standard Configuration With Waveguide Isolator(s) Add 7 K to Standard Configuration Example: For a 1:1 system with 30 K LNBs, waveguide isolator and Tx reject filter, the system noise temperature at Example: +23 C is given by: T SYS = 30 K (LNB) + 7 K (Standard configuration) + 7 K (isolator) + 3 K (filter) = 47 K Table 2 Noise Temperature vs. Ambient Temperature (Copy and FAX this page to MAXTECH.) Standard system includes: Plate Cable O&M Test LNBs Controller Assy Assy Manuals Data 1100 = 1:1 System 2 1 1 1-100 ft 1 x 1200 = 1:2 System 3 1 1 1-100 ft 1 x 1111 = Dual 1:1 System 4 2 1 2-100 ft 1 x LNB Model number: Options Available: A. Cable length ft or m. H. Remote Panel(s) B. Waveguide Input Isolator(s) I. Cable for Remote Panel C. Transmit Reject Filter(s) ft or m. D. Input Crossguide Coupler(s) J. External Alarm Option (J6) for 40 db (std), db Controller E1. Offline LNB Input Port K. TTL Outputs instead of Form C E2. Offline LNB Output Port L. Additional O&M Manuals, F. Chassis Slides for Controller Qty.: G. Serial I/O (See Serial I/O Controllers data sheet.) Noise temperature vs. ambient temperature can be found from the equation NT 2 T 2 = NT 1 T 1 n where NT 2 = Noise Temperature at T 2 NT 1 = Noise Temperature at T 1 T 2 = Temperature 2 in K T 1 = Temperature 1 in K n = 1.5 for LNB, 1.0 for passive losses For the case where T 1 = 296 K (+23 C), the ratio NT 2 /NT 1 is shown in the table at right for both LNBs (n = 1.5) and for passive losses (n = 1.0): Ambient Temperature n = 1.5 n = 1.0 T 2 ( C) NT 2 /NT 1 NT 2 /NT 1 0 0.89 0.92 +23 1.00 1.00 +40 1.09 1.06 +50 1.14 1.09 +60 1.19 1.13 Example: 1:1 system with Tx filter and 30 K LNB. T LNB = 30 K at +23 C, passive losses = 10 K at +23 C; thus T SYS = 40 K at +23 C. What is T SYS at +50 C? From the table, NT 2 /NT 1 at 50 C = 1.14 for the LNB and 1.09 for the passive losses. NT 2 = 1.14 x (30 K) + 1.09 x (10 K) NT 2 = 34.2 K + 10.9 K = 45.1 K at +50 C. 7239A 3
MAXTECH, Inc. Technology for Communications 1:1 Controller Front Panel 1:2 Controller Front Panel Controller Rear Panel Specifications LNB Status Monitor Method Window Width Switchover Time Remote I/O: Interface type Connector Status outputs Control inputs Control Panel Dimensions Cable Length to Plate Assy Control panel monitors LNB bias current. Alarm is generated if current goes outside of allowed tolerance window. ±5 ma to ±25 ma in 5 ma steps; jumper selectable 100 ms Parallel I/O 37 pin D, male (2 connectors in parallel) Form C dry relay contacts; 100 Vdc / 0.5 A / 3 W max (resistive load) Contact closures to ground; withstand 15 V, sink 20 ma 19" (483 mm) W x 3.47" (88.1 mm) H x 17.5" (445 mm) D; 25 lb (11.4 kg) 30 m (100 ft) standard, up to 150 m (500 ft) optionally available Controller AC Input 100/120/220/240 Vac (selectable on rear panel), +10%, -13%, 47 63 Hz, 30 W. Dual AC inputs and dual redundant power supplies. Temperature Range 0 to +50 C 4 7239A
Front Panel Controls and Indicators LNB Status Alarms PS1, PS2 Indicators Lamp Test Pushbutton Select Pushbuttons and Indicators Auto/Manual Switch and Indicators Remote/Local Switch and Indicators LED Indicators glow red when a block converter fault is detected. Show status of the dual redundant power supplies. Lights all indicators. Pushbuttons are used to manually select the LNBs. Indicators show which LNBs are switched on line. In 1:1 systems, LNB1 is normally the primary block converter and LNB2 is on standby. In 1:2 systems, LNB1 and LNB2 are the primary block converters for Polarization 1 and Polarization 2, respectively. LNB3 is the standby block converter and can be selected for either polarization. In Auto mode, an LNB failure initiates automatic switchover to the standby LNB. In manual mode, the on-line LNB can be selected from the front panel. Selects local control or control from the optional remote panel. Rear Panel I/O Interface LINE 1 - J1, LINE 2 - J2 TO PLATE ASSEMBLY - J3 REMOTE I/O - J4, J5 Dual power entry modules contain the AC line input connector, a fuse, power switch and a voltage selector for switching between 110/220V operation. System can be powered from separate AC lines if desired. Either or both power supplies are capable of operating the system. Cable to antenna plate assembly carries LNB power and switch drive signals. System normally supplied with 100 feet of control cable; other lengths optional. Remote I/O connections. J4 and J5 are connected in parallel. One connector is available for customer control or monitoring, the other is for the optional remote control panel. Panel is capable of controlling all features of the system except remote/local switch. Form C relay contact outputs (1:1 systems): LNB1 status PS1 status Auto/Manual mode LNB2 status PS2 status Local/Remote mode Switch position Control inputs contact closure to ground (1:1 systems): LNB1 select LNB2 select Auto/Manual select Form C relay contact outputs (1:2 systems): LNB1 status PS1 status Auto/Manual mode LNB2 status PS2 status Pol. 1: LNB1 or LNB3 LNB3 status Local/Remote mode Pol. 2: LNB2 or LNB3 Control inputs contact closure to ground (1:2 systems): Pol. 1: LNB1 select Pol. 2: LNB2 select Auto/Manual select Pol. 1: LNB3 select Pol. 2: LNB3 select EXT ALARM IN - J6 (Optional) External Alarm inputs. Substitute for internal LNB current monitor alarms. Allows an external signal to indicate LNB failure. 7239A 5
MAXTECH, Inc. Technology for Communications 1:1 Plate Assembly Outline Drawing, with Various Options Installed Outline 7317 6 7239A
1:2 Plate Assembly Outline Drawing, with Various Options Installed Outline 7123-1 7239A 7
Dual 1:1 Plate Assembly Outline Drawing, with Various Options Installed Outline 7380 MAXTECH, Inc. A subsidiary of Vertex Communications Corporation 7239 Rev. A 4/22/98 Specifications are subject to change at Maxtech's discretion. 8 7239A